List of free software web applications

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All web applications, both traditional and Web 2.0 are operated by software running somewhere. This is a list of free software which can be used to run alternative web applications. Also listed are similar proprietary web applications that users may be familiar with. Most of this software is server-side software, often running on a web server.

Application Service License Requirements Similar proprietary web application(s)
Gallery Photo sharing GPL 3 MySQL flickr, Picasa
Piwigo Photo sharing GPL MySQL + PHP flickr, Picasa
OpenBroadcaster Video streaming AGPL 3 MySQL YouTube
Plumi Video streaming GPL | ZPL YouTube
Libre.fm Music streaming AGPL PostgreSQL or MySQL last.fm
CiteSeerX Bibliographic database Apache MySQL or PostgreSQL SpringerLink
OpenStreetMap Mapping CC MySQL or PostgreSQL Google Maps
ownCloud File sharing AGPL 3 DropBox, drop.io
Tahoe Least-Authority Filesystem File sharing GPL 2 + DropBox, drop.io
iFolder File sharing GPL 2 + DropBox, drop.io
AbiCollab Online file editing GPL 2 MySQL or PostgreSQL Google Docs
Etherpad Online file editing Apache MySQL or PostgreSQL Google Docs
Eucalyptus (computing) Virtual machine provisioning GPL 3 Amazon EC2
Globus Toolkit Virtual machine provisioning Apache + MySQL or PostgreSQL Amazon EC2
OpenNebula Virtual machine provisioning Apache SQLite3 Amazon EC2
DokuWiki Wiki GPL 2 Wikispaces
MediaWiki Wiki GPL 2 MySQL or PostgreSQL Wikispaces
Open Journal Systems Publication management GPL 2 MySQL or PostgreSQL
WordPress Blogging GPL 2 MySQL blogger.com
LiveJournal Blogging blogger.com
Jaiku Blogging GPL 2 blogger.com
StatusNet Microblogging AGPL 3 MySQL or PostgreSQL Twitter
Piwik Web analytics GPL 3 Google Analytics
AppScale Virtual web hosting BSD Google AppEngine
PHPGroupware Online office suite GPL 2 Google Docs,
Feng Office Online office suite Google Docs,
Etherpad Online office suite Apache / BSD / LGPL / GPL 2 Google Docs,
Roundcube Web mail Gmail, Hotmail
IMP Web mail GPL 2 IMAP server Gmail, Hotmail
Funambol Web mail AGPL Gmail, Hotmail
Xuheki Web mail GPL 3 Gmail, Hotmail
Squirrelmail Web mail Gmail, Hotmail
Mailman Mailing lists GPL Google Groups, Yahoo Groups
FluxBB Forum GPL 2
phpBB Forum GPL 2
Phorum Forum Phorum 2.0
Vanilla Forum GPL 2
Funambol Web calendar AGPLv3 30 Boxes, Google calendar
OpenConf Submission management system
EasyChair Submission management system
LimeSurvey Internet survey SurveyMonkey, Surveytool, Google Form creator
Cheetah News RSS reader GPL 3 Google Reader
Identi.ca Social aggregation AGPL FriendFeed
Meneame Social news Digg
Reddit Social news Common Public Attribution v1.0 (CPAL) Digg
Mixx Social news Digg
Friendica Distributed social network MIT Facebook
Diaspora Distributed social network AGPL Facebook
BuddyPress Distributed social network GPL WordPress Facebook
Elgg Distributed social network GPLv2 / MIT Facebook
Scuttle Social bookmarking Delicious
Rubric Social bookmarking Delicious
Connotea Social bookmarking Delicious
ShiftSpace Social bookmarking Delicious
Ma.gnolia 2 Social bookmarking Delicious
OpenID Identity / Credentials
OAuth Identity / Credentials
Shibboleth Identity / Credentials
CAcert.org Encryption
Apertium Translation GPLv2 Google Translator
EyeOS Homepage iGoogle
OpenCroquet Virtual world SecondLife
OpenSimulator Virtual world SecondLife

Other lists of free software web applications[edit]